Remove the CIBuild flag from the source tree

This flag was only used to add unecessary differences of behavior
from local developer builds. By removing the flag everything acts
the same.

BuildAndTest.proj

@@ -12,12 +12,9 @@
   <PropertyGroup>
     <RoslynSolution>$(MSBuildThisFileDirectory)Roslyn.sln</RoslynSolution>
     <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
-    <RunTestArgs></RunTestArgs>
-    <RunTestArgs Condition="'$(Test64)' == 'true'">-test64</RunTestArgs>
+    <RunTestArgs>$(RunTestArgs) -xml</RunTestArgs>
+    <RunTestArgs Condition="'$(Test64)' == 'true'">$(RunTestArgs) -test64</RunTestArgs>
     <IncludePattern Condition="'$(IncludePattern)' == ''">*.UnitTests*.dll</IncludePattern>
-
-    <!-- Emit XML in a CIBuild in order to get structured test results -->
-    <RunTestArgs Condition="'$(CIBuild)' == 'true'">$(RunTestArgs) -xml</RunTestArgs>
   </PropertyGroup>
 
   <Target Name="RestorePackages">

cibuild.cmd

@@ -24,14 +24,14 @@ move Binaries\%BuildConfiguration%\* %RoslynRoot%\Binaries\Bootstrap
 msbuild /v:m /t:Clean build/Toolset.sln /p:Configuration=%BuildConfiguration%
 taskkill /F /IM vbcscompiler.exe
 
-msbuild /v:m /m /p:BootstrapBuildPath=%RoslynRoot%\Binaries\Bootstrap BuildAndTest.proj /p:CIBuild=true /p:Configuration=%BuildConfiguration%
+msbuild /v:m /m /p:BootstrapBuildPath=%RoslynRoot%\Binaries\Bootstrap BuildAndTest.proj /p:Configuration=%BuildConfiguration%
 if ERRORLEVEL 1 (
     taskkill /F /IM vbcscompiler.exe
     echo Build failed
     exit /b 1
 )
 
-msbuild /v:m /m /p:BootstrapBuildPath=%RoslynRoot%\Binaries\Bootstrap src/Samples/Samples.sln /p:CIBuild=true /p:Configuration=%BuildConfiguration%
+msbuild /v:m /m /p:BootstrapBuildPath=%RoslynRoot%\Binaries\Bootstrap src/Samples/Samples.sln /p:Configuration=%BuildConfiguration%
 if ERRORLEVEL 1 (
     taskkill /F /IM vbcscompiler.exe
     echo Build failed